Cellular repeater watermarking system and method
US7917084B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 4, 2007 |
| Grant date | Mar 29, 2011 |
| Priority date | — |
| Expiry date | Feb 7, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W92/16
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and system for providing a watermark by amplitude modulating data onto signals being repeated from and/or to a cellular telephone handset without degrading the performance of the cellular telephone system. An exemplary cellular repeater system may include a first communication device configured to receive a cellular telephone signal from a handset. The cellular telephone signal is amplified by a variable gain amplifier configured to create an adjusted signal. The amplification factor applied by the variable gain amplifier is controlled by a message encoder configured in accordance with a predetermined encoding scheme. The adjusted signal is then transmitted to a base station by a second communication device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.